Comparison of ankle angle adaptations of prosthetic feet with and without adaptive ankle angle during level ground, ramp, and stair ambulations of a transtibial amputee: A pilot study

Ko, Chang-Yong; Kim, Solbi; Kim, Jong Kwon; Chang, Yun Hee; Kim, Shin-Ki; Ryu, Jeicheong; Mun, Mingyon

doi:10.1007/s12541-014-0645-x

Cited by 14 publications

(25 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In ESRFs, bending of both keel and the ankle joint was caused by the participant's weight during the stance phase, whereas in PFAAs there was only keel bending. In the swing phase, a greater ROM during dorsiflexion was shown for PFAAs, indicating that PFAAs can adjust their ankles to enhance foot clearance [6,7,13]. During the stance phase, the highest flexion in the knee and hip were shown in ESRFs, and less flexion in the knee and hip was shown in the élan and echelon compared to that in the Proprio-foot.…”

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Biomechanical features of level walking by transtibial amputees wearing prosthetic feet with and without adaptive ankles

Kim

et al. 2016

J Mech Sci Technol

Self Cite

View full text Add to dashboard Cite

This study aimed to evaluate the kinematics and kinetics of the lower limb in both the intact and amputated leg in individuals with transtibial amputations wearing Energy storage and return feet (ESRFs) with fixed ankles and Prosthetic feet with adaptive ankles (PFAAs) during level walking. Three individuals with transtibial amputations walked on level ground wearing their own ESRFs and PFAAs. Spatiotemporal parameters, kinematics, and kinetics of the lower-extremity joints were measured in the amputated and intact legs. There were differences in the kinematics of the joints in the amputated leg and of the ankle in the intact leg between ESRFs and PFAAs. Differences in joint moments, power, and stiffness in most joints in both legs and braking impulse were found between ESRFs and PFAAs. Thus, although it was a pilot study with three subjects, ankle angle control mechanisms (ESRFs: Fixed ankle vs. propriofoot: Mechanical motor vs. élan and echelon: Hydraulic actuator) might affect biomechanical features during level walking.

show abstract

Section: Discussionmentioning

confidence: 97%

“…Although we performed comparisons among such PFAAs, only ankle joint adaptation was evaluated on level ground, a ramp, and stairs [13]. To further understanding of the complex biomechanical interactions in each foot during level walking, kinematic and kinetic studies on joint coordination in the ankle, knee, and hip are required.…”

Section: Introductionmentioning

confidence: 99%

Biomechanical features of level walking by transtibial amputees wearing prosthetic feet with and without adaptive ankles

Kim

et al. 2016

J Mech Sci Technol

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ko et al [20] presented qualitative results only for the prosthethic side of one person with amputation walking on ramps with different prosthesis. Their results on the prosthetic side showed a relationship between stance and swing phase of approximately 60 to 40% [20], which is similar to the results obtained in this study.…”

Section: Spatio Temporal Parameters (Stp)mentioning

confidence: 99%

“…The author suggested that this could be one of the possible reasons for the increase in reported levels of satisfaction. Ko et al [20] evaluated ankle angle and external work symmetry on different terrains (level ground, 7° slope, 15 cm high stairs) and found an overall increase in symmetry in PFAA and PFAA-MC. The authors then discussed that this improvement in symmetry when using adaptive ankle feet may influence spatiotemporal parameters.…”

Section: Introductionmentioning

confidence: 99%

Spatio temporal parameters and symmetry in subjects ascending and descending a ramp, using three different prosthetic feet

et al. 2020

View full text Add to dashboard Cite

This study aimed at evaluating spatiotemporal parameters (STP) and symmetry index (SI), commonly used for evaluating amputee gait for routine clinical use, in individuals with unilateral transtibial amputations wearing energy storage and return (ESAR) feet with fixed ankles, prosthetic feet with adaptive ankles (PFAA) and prosthetic feet with microcontrolled adaptive ankles (PFAA-MC) in ramp ascent and descent. Thirteen individuals with transtibial amputations walked up and down a ramp. The STPs were measured in the amputated and intact legs and the relationship between them was quantified using the SI. The results showed that the use of PFAA-MC decreases walking speed in ramp descent (P ≤ 0.018). However, this was the only parameter that showed a significant change. Hence, the differences in the amputees' gait pattern when using the above-mentioned prostheses may not be reflected by STP and their SI.

show abstract

“…In static conditions, Ernst et al investigated a cohort of people with an amputation using five different feet while standing on flat and inclined surfaces (Meridium™, Propriofoot™, Elan™, Triton,™ and Raize™) and showed that the increased range of motion and the dorsiflexion stop allow an adaptation closer to the one of asymptomatic subjects. 10 In dynamic conditions, Ko et al 11 compared two different MPAs (Elan™ and Propriofoot™) with an ESR foot on one transtibial patient. They observed an increase of the stance phase duration during ambulation combined with a greater dorsiflexion while using the MPAs on slope.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization of the moment-angle curve during level and slope locomotion of transtibial amputee: Which parameters can be extracted to quantify the adaptations of microprocessor prosthetic ankle?

Davot

Thomas-Pohl

Villa

et al. 2021

Proc Inst Mech Eng H

View full text Add to dashboard Cite

In case of transtibial amputation, the deficit resulting from the loss of the lower limb can be partly compensated with a prosthetic foot and adapted rehabilitation. New prosthetic feet have been developed for transtibial amputees to mimic ankle adaptability to varying terrain. Among them, Microprocessor Prosthetic Ankles (MPA) have a microprocessor to control an electric or a hydraulic actuator to adapt ankle kinematics in stairs and slopes. The objective is to investigate parameters extracted from the moment-angle curve (MAC) and use them to compare 3 MPA during level and slope locomotion against energy storing and return (ESR) foot. Five persons with lower limb transtibial amputation successively fitted with 3 MPA (Propriofoot™, Elan™, Meridium™) compared to their ESR foot. The participants had 2 weeks of adaptation before data acquisition and then a 3 week wash-out period. Range of motion, equilibrium point, hysteresis, late stance energy released, and quasi-stiffness were computed on level ground and 12% slope (upward and downward) thanks to the MAC at the ankle. The study shows the relevance of MAC parameters to evaluate the behavior of MPA. In particular, compared to ESR, all MPA tested in the present study demonstrated a better angle adaptation between walking conditions but a decrease of available energy for the propulsion. Among MPA, main results were: (i) for the Propriofoot™: an adaptation of the ankle angle without modification of the pattern of the MAC (ii) for the Elan™: a limited adaptation of the range of motion but a modification of the energy released (iii) for the Meridium™, the highest adaptation of the range of motion but the lowest available energy of propulsion. One of the main findings of the research is to show and quantify the relationship between range of motion and energy available when using different prosthetic feet in different walking conditions.

show abstract

Comparison of ankle angle adaptations of prosthetic feet with and without adaptive ankle angle during level ground, ramp, and stair ambulations of a transtibial amputee: A pilot study

Cited by 14 publications

References 8 publications

Biomechanical features of level walking by transtibial amputees wearing prosthetic feet with and without adaptive ankles

Biomechanical features of level walking by transtibial amputees wearing prosthetic feet with and without adaptive ankles

Spatio temporal parameters and symmetry in subjects ascending and descending a ramp, using three different prosthetic feet

Experimental characterization of the moment-angle curve during level and slope locomotion of transtibial amputee: Which parameters can be extracted to quantify the adaptations of microprocessor prosthetic ankle?

Contact Info

Product

Resources

About